Array.hs

-- | 'A.Array' variants of "Sound.SC3.Common.Buffer".
module Sound.SC3.Common.Buffer.Array where

import qualified Data.Array as A {- array -}

import qualified Sound.SC3.Common.Buffer as SC3

-- | 'SC3.clipAt'.
clipAt :: Int -> A.Array Int a -> a
clipAt ix c =
    let (l,r) = A.bounds c
        f = (A.!) c
    in if ix < l then f l else if ix > r then f r else f ix

-- | 'C.blendAtBy' of 'clipAt'.
--
-- > blendAt 0 (A.listArray (0,2) [2,5,6]) == 2
-- > blendAt 0.4 (A.listArray (0,2) [2,5,6]) == 3.2
blendAt :: RealFrac a => a -> A.Array Int a -> a
blendAt = SC3.blendAtBy clipAt

-- | 'C.resamp1'.
--
-- > resamp1 12 (A.listArray (0,3) [1,2,3,4])
-- > resamp1 3 (A.listArray (0,3) [1,2,3,4]) == A.listArray (0,2) [1,2.5,4]
resamp1 :: RealFrac n => Int -> A.Array Int n -> A.Array Int n
resamp1 n c =
    let (_,r) = A.bounds c
        gen = SC3.resamp1_gen n (r + 1) clipAt c
        rs = map gen [0 .. n - 1]
    in A.listArray (0,n - 1) rs